JPH06105155B2 - Heated object container for sintering - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating object container for sintering which is used when heating an object to be heated such as ceramics and metal powder to a high temperature to sinter. .

[Conventional technology and its problems]

In a ceramics sintering furnace that heats and sinters a heated object such as ceramics to a high temperature of around 2000 ° C under reduced pressure or increased pressure in an inert gas atmosphere, the temperature of the heated object is soaked to ± 10 ° C. In some cases, strict soaking properties are required. However, in the conventional sintering method, it took a very long time to transfer the heat to the inside of the object to be heated, so that it was not easy to attain such heat uniformity. Therefore, there is a problem that soaking takes time and productivity deteriorates. Therefore, it has been known in the past to provide a fan in the furnace to stir the atmosphere gas in the furnace to improve the temperature. Was not achieved.

[Means for solving problems]

The present invention is intended to provide a heating object container for sintering that solves the above-mentioned problems of the prior art. A small-diameter cylindrical body is vertically provided at the inner peripheral edge of a plate having a through hole, and the outside of the plate is provided. It is characterized in that a large-diameter cylindrical body is vertically provided on the peripheral edge, and an object to be heated is accommodated in a space formed by the plate, the small-diameter cylindrical body, and the large-diameter cylindrical body.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. First, the outline of the sintering furnace will be described with reference to FIG. The pressure vessel 1 has a cylindrical body portion 2 and a canopy portion 3 which are connected to each other by flange portions 4 and 4, and the bottom lid portion 5 and the flange portions 6 and 6 of the body portion 2 are attached by detachable tightening rings 7. It is tightened so that the inside can be airtightly closed. Reference numeral 8 denotes a communication port that communicates with the inside of the pressure vessel 1. The communication port 8 is connected to a pressure pump or a pressure reduction pump that pressure-feeds a required atmospheric gas. Reference numerals 9 and 9 are insertion ports through which a thermocouple for temperature measurement can be airtightly inserted into the pressure vessel.

A processing chamber 11 is provided in the pressure vessel 1 by forming a heat insulating wall in a cylindrical shape so that a ventilation gap 10 exists between the pressure vessel 1 and the inner surface thereof. The processing chamber 11 is covered with a lid member 13 on a body portion 12, and the lid member 13 is a cylinder 1 provided outside the ceiling of the pressure vessel 1.
It is suspended on the operating rods 15,15 of 4,14. Then, the cylinders 14, 14 are actuated to lift the lid member 13 as shown in FIG. 2 so that an opening 16 is formed in the outer periphery of the upper portion of the body portion 12. A bottom lid member is provided at the bottom of the processing chamber 11.
17 is fitted and a table 18 provided on the bottom lid member 17
The object to be heated 19 is placed in the container 20 to be heated. The bottom lid member 17 is supported by the bottom lid portion 5 of the pressure vessel 1. An opening 22 is opened at the center of the bottom lid member 17, and a plug member 23 is fitted into this. And the cylinder 21 provided on the bottom lid 5
All the members 23 are fixedly attached to the operating rod of the opening 23 by moving the plug member 23 forward and backward by the operation of the cylinder 21.
Is designed to open and close. 24 is the object to be heated in the processing chamber 11
It is an electric heater made of carbon provided in a form surrounding 19. Further, reference numeral 25 denotes a fan rotation shaft 26 provided on the ceiling of the processing chamber 11, and a bearing 26 provided on the canopy portion 3 penetrates the lid member 13.
A permanent magnet 28 is supported on the rotating shaft 26 on the lid protruding portion.
Is stuck. 29 is a rotary shaft surrounding the permanent magnet
An airtight holding cover made of a magnetically permeable material fixed to the outer surface of 26. An annular permanent magnet 30 is provided on the outside of the cover 29 so as to surround the cover 29 and is fixed to a rotary shaft 31. The rotary shaft 31 is wound around a rotary shaft of a motor 32 and a pulley of the transmission belt 33. The permanent magnet 30 is rotated around the cover 29 by driving the motor 32. When the permanent magnet 30 rotates, the permanent magnet 28 inside the cover 29
Is induced by a magnetic force to rotate the rotary shaft 26 in the same direction and rotate the fan 25. Reference numeral 34 is a cooler provided in the ventilation gap 10, and the cooler is configured so that cooling water flows through the heat transfer pipe.

The object container 20 for containing the object to be heated 19 is made of a material of the same system as the object to be heated 19, that is, made of ceramics in this case, and is enlarged as shown in FIGS. 3 and 4. In addition, a plurality of discs 36 having a through hole 35 formed in the central portion, a small-diameter cylindrical body 37 having both ends fitted into the through-hole 35, and a large-diameter cylindrical body fitted to the outer peripheral edge of the circular plate 36. 38 and each cylinder 3 in the mated state
An annular space 39 is formed by stacking 7 and 38 so as to be sandwiched by the discs 36, and the object to be heated 19 is accommodated in the annular space 39, so that a ventilation hole 40 is formed in a longitudinal shape in the central portion.

In this sintering furnace, at the time of heating and heating, the lid member 13 and the plug member 23 are closed to thermally shield the processing chamber 11 by its heat insulating wall as shown in FIG. Then, the object to be heated 19 in the object to be heated 20 is heated by the electric heater 24. The fan 25 forcedly convects the atmospheric gas in the processing chamber 11 as indicated by the broken line arrow in the figure. That is, the processing chamber heated by the electric heater 24
The atmospheric gas in 11 convects not only the outside of the heat-treated container 20 but also the ventilation hole 40 that penetrates the center thereof and heats the heat-treated object 19 contained in the annular section 39 from both the outside and the inside. Then, the object to be heated 19 is uniformly heated to around 2000 ° C. and sintered. On the other hand, when cooling the heated object 19, the cylinders 14, 14,
21 is operated to move the lid member 13 and the stopper member 23 to open the openings 16 and 22 as shown in FIG. Then, the cooling water is passed through the cooler 34 and the fan 25 is rotated to allow the atmospheric gas to flow through the ventilation gap 10 as indicated by the broken line arrow in FIG. That is, the atmospheric gas in the processing chamber 11 is guided from the opening 16 to the ventilation gap 10 and passed through the cooler 34 to be cooled and circulates in the processing chamber 11 through the opening 22. It is struck and cooled.

In addition, the diameter of 30 m
When a sample (ceramics) was heated to 1600 ° C in a N ₂ atmosphere gas with a m-hole provided, there was a temperature difference of 30 ° C without a hole. The difference was reduced to 15 ℃. Further, when the atmospheric gas was forced to convection with a fan as in this example, the temperature difference was further reduced to 8 ° C., and soaking was achieved extremely effectively.

In addition, the object container of this embodiment is an example including a plurality of discs, a plurality of small-diameter cylinders, and a large-diameter cylinder. However, the plate does not have to be a disc, and one plate can be used. It may be. Furthermore, the lid may be placed on the upper part of the object container as in the embodiment, or may not be placed.

〔The invention's effect〕

As described above, the heating target object container for sintering according to the present invention has a space formed by vertically arranging a small-diameter cylindrical body and a large-diameter cylindrical body at the inner peripheral edge and the outer peripheral edge of the plate having the through holes. Since the object to be heated is accommodated, the atmospheric gas is also convected in this small-diameter cylindrical body by the heat radiation of the outer peripheral surface of the small-diameter cylindrical body,
The object to be heated can be heated or cooled from the inside. For this reason, the temperature distribution of the object to be heated can be improved rapidly and the temperature distribution thereof can be greatly improved. Therefore, there is a remarkable effect of improving the quality and productivity of sintered ceramic products and the like.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a vertical cross-sectional view of a sintering furnace, Fig. 2 is a vertical cross-sectional view showing its operating state, and Fig. 3 is an enlarged view of a heated object container. Longitudinal section, Fig. 4 is the third
It is the XX sectional view taken on the line of FIG. 19 ... Heated object, 20 ... Container, 35 ... Through hole, 36 ... Disc,
37 …… small diameter cylinder, 38 …… large diameter cylinder, 39 …… annular space, 40
...... Vents.

Continuation of the front page (56) Reference JP-A-49-17805 (JP, A) JP-A-52-41105 (JP, A) JP-A-57-116701 (JP, A) Actual development 60-105627 (JP , U)

Claims (1)

[Claims] 1. A small-diameter cylindrical body is hung on an inner peripheral edge of a plate having a through hole, and a large-diameter cylindrical body is hung on an outer peripheral edge of the plate, and the plate, the small-diameter cylindrical body, and the large-diameter cylindrical body. A heat target container for sintering, characterized in that a heat target is housed in a space formed by